Check out an article by CNET. http://crave.cnet.co.uk/laptops/0,39...9283370,00.htm
|Unsurprisingly, we didn't spot much difference between the three processors during 3D gaming tests. They returned a nearly identical score in 3DMark 2005 and pretty much the same frame rates in F.E.A.R. As expected, the major bottleneck here is the graphics card. The Core 2 Duo processor is likely to be better than the Core Duo at running CPU-intensive games (such as those that display large numbers of non-playable characters on a screen simultaneously), but in most gaming situations the two CPUs are very similar.
|Ultimately, we have to conclude that the performance delta between Core Duo and Core 2 Duo is relatively small in most cases, but there are noticeable differences when running CPU-intensive applications. When using your laptop for simple everyday tasks like writing Word documents you'll notice zero advantage with a Core 2 Duo. However, the new CPUs come into their own when performing more demanding tasks such as 3D rendering. Here it outperforms its predecessor by a notable, if hardly mind-blowing margin.